National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

4 Miles SW San Marcos TX

  • Overnight

    Overnight: Increasing clouds, with a low around 63. South wind around 10 mph.

    Low: 63 °F

    Increasing
    Clouds

  • Monday

    Monday: Cloudy through mid morning, then gradual clearing, with a high near 87. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 87 °F

    Gradual
    Clearing

  • Monday Night

    Monday Night: Increasing clouds, with a low around 64. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 64 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Cloudy, then gradually becoming mostly sunny, with a high near 89. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 89 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 67. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 67 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 91. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 91 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 66 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85. South wind around 10 mph, with gusts as high as 20 mph.

    High: 85 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 66. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 66 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Increasing clouds, with a low around 63. South wind around 10 mph.
Monday
Cloudy through mid morning, then gradual clearing, with a high near 87. South wind 5 to 15 mph, with gusts as high as 25 mph.
Monday Night
Increasing clouds, with a low around 64. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Cloudy, then gradually becoming mostly sunny, with a high near 89. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 67. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
Mostly cloudy, with a high near 91. South wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85. South wind around 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 66. South southeast wind around 10 mph, with gusts as high as 20 mph.
Friday
Partly sunny, with a high near 88.
Friday Night
Mostly cloudy, with a low around 67.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 84.
Saturday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
Sunday
A 40 percent chance of showers. Mostly cloudy, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW San Marcos TX
 29.86°N 97.99°W (Elev. 748 ft)
Last Update:
12:44 am CDT Mar 30, 2026
Forecast Valid:
12am CDT Mar 30, 2026-6pm CDT Apr 5, 2026
 
Forecast Discussion
 
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Additional Resources

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